linux-kernel - Re: [RFC PATCH 2/7] iommu: Add share domain interface in iommu for spimdev

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Date:   Wed, 8 Aug 2018 11:13:54 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Kenneth Lee <nek.in.cn@...il.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kenneth Lee <liguozhu@...ilicon.com>,
        Hao Fang <fanghao11@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, iommu@...ts.linux-foundation.org,
        kvm@...r.kernel.org, linux-accelerators@...ts.ozlabs.org,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Sanjay Kumar <sanjay.k.kumar@...el.com>, linuxarm@...wei.com
Subject: Re: [RFC PATCH 2/7] iommu: Add share domain interface in iommu for
 spimdev

On Wed, Aug 01, 2018 at 06:22:16PM +0800, Kenneth Lee wrote:
> From: Kenneth Lee <liguozhu@...ilicon.com>
> 
> This patch add sharing interface for a iommu_group. The new interface:
> 
> 	iommu_group_share_domain()
> 	iommu_group_unshare_domain()
> 
> can be used by some virtual iommu_group (such as iommu_group for spimdev)
> to share their parent's iommu_group.
> 
> When the domain of the group is shared, it cannot be changed before
> unshared.  In the future, notification can be added if update is required.

>From the description or the patch I don't really get why this is needed.
Please update the description and make a case for this API addition.


	Joerg